You are implementing a method that uses Entity Framework POCO entities that do not support proxies. This method retrieves a Product entity and changes its Status property. You need to ensure that the ObjectStateManager tracks this change so that the data source can be updated.

Which ObjectContext method should you call?

The ObjectContext's DetectChanges method ensures that ObjectStateEntry changes are synchronized with changes in all objects that are tracked by the ObjectStateManager. Call this method when you are using POCO entities without proxies to ensure that changes are synchronized.

The ObjectContext's SaveChanges method writes changes to the data source. This method does not ensure that ObjectStateEntry changes are synchronized with changes in all objects that are tracked by the ObjectStateManager. Changes must be synchronized before the SaveChanges method is called.